<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
</head>
<body>
    <div id="app">
        <p v-for="item of arr">
            <input type="checkbox" v-model="item.checked">{{item.name}}
        </p>
        <p>
            <input type="checkbox" v-model="allChecked">
            <span>全选/反选</span>
            
        </p>
    </div>
    <script>
        new Vue({
            el:"#app",
            data:{
                arr:[
                    {name:"html",checked:false},
                    {name:"css",checked:false},
                    {name:"js",checked:false},
                    
                ]
            },
            computed:{
                allChecked:{
                    get(){
                       return this.arr.every(item=>item.checked) 
                    },
                    set(val){
                        console.log(val);
                        var arr =this.arr;
                        arr.forEach(item=>item.checked=val);
                        this.arr=arr
                    }
                    
                }
            }
            

        })
    </script>
</body>
</html>